I worked for Yahoo Travel from 2004-2011 including on Trip Planner for several years, AMA? If they were talking about the mobile app thing though, I don't really know about that, that was done by another group with our data and then AFAIK left to wither on the vine; Yahoo's mobile strategy wasn't ever clear and never worked out for the lower importance properties like Travel. Travel itself got turned into a 'magazine' property with just articles then fully killed after I left.
To add a little blurb about what Trip Planner was, you could make a Trip (yahoo login require), and you could share with your friends (I believe we had read-only or read/write permissions) and make it public or keep it private. A trip had two main parts: the plan and an (optional) journal.
The plan would let you add items such as a hotel or point of interest or restaurant from our catalog, your flight details perhaps, or just a city, and you could also add your own items if you wanted to stop somewhere not in our catalog. You could also add notes to the items, and schedule them. You could see them all on a map and do multipoint driving directions (which was cool when we did it!). You could add things from the trip plan page, or while browsing our site Y! Travel was like 1/3rd a booking frontend for Travelocity and later someone else, 1/3rd a travel guide like TripAdvisor, and 1/3rd other stuff like Trip Planner; the travel guide section add links to add stuff to your trip plan or view other people's trip plans that had that stuff in it.
The journal was more or less a blog thing; text and pictures etc. Some people would work on these while on their trip, but probably more would fill it out when they got home as a way to kind of remember and share their experience.
Public trips had a comments section (optionally) and there was a 'like' button, the owner could add tags, but others could also add tags. All the web 2.0 junk.
To add a little blurb about what Trip Planner was, you could make a Trip (yahoo login require), and you could share with your friends (I believe we had read-only or read/write permissions) and make it public or keep it private. A trip had two main parts: the plan and an (optional) journal.
The plan would let you add items such as a hotel or point of interest or restaurant from our catalog, your flight details perhaps, or just a city, and you could also add your own items if you wanted to stop somewhere not in our catalog. You could also add notes to the items, and schedule them. You could see them all on a map and do multipoint driving directions (which was cool when we did it!). You could add things from the trip plan page, or while browsing our site Y! Travel was like 1/3rd a booking frontend for Travelocity and later someone else, 1/3rd a travel guide like TripAdvisor, and 1/3rd other stuff like Trip Planner; the travel guide section add links to add stuff to your trip plan or view other people's trip plans that had that stuff in it.
The journal was more or less a blog thing; text and pictures etc. Some people would work on these while on their trip, but probably more would fill it out when they got home as a way to kind of remember and share their experience.
Public trips had a comments section (optionally) and there was a 'like' button, the owner could add tags, but others could also add tags. All the web 2.0 junk.
Courtesy of the Internet Archive, here's someone's trip that was highlighted at some point: their trip plan https://web.archive.org/web/20111027022849/http://travel.yah... and their trip journal https://web.archive.org/web/20111103064256/http://travel.yah...